Pressure plate instrument capable of directly measuring volume change of soil sample

Abstract

The invention discloses a pressure plate instrument capable of directly measuring the volume change of a soil sample. The instrument consists of a pressure container, a horizontal displacement sensor, a vertical displacement sensor, a sensor bracket, a high air inlet value ceramic plate, a base, the soil sample, a drainage volume measuring device and an upper cover of the pressure container, wherein the drainage volume of the soil sample can be measured by the drainage volume measuring device; the horizontal displacement sensor and the vertical displacement sensor which are arranged on the sensor bracket can be used for measuring the deformation of the soil sample in horizontal and vertical directions in the testing process; and the volume and volume strain of the soil sample can be accurately calculated through the deformation value of the soil sample in horizontal and vertical directions.

Description

[0001] technical field [0002] The invention relates to a pressure plate meter device which can directly measure the volume change of soil samples in soil mechanics and foundation engineering. Background technique [0003] The soil-water characteristic curve of soil, also known as the moisture characteristic curve, is the relationship curve between the matric suction of unsaturated soil and the gravitational water content, volumetric water content, saturation or effective saturation. The soil-water characteristic curve is related to factors such as soil structure, soil particle composition, and pore size distribution, and reflects the soil's ability to hold water. It plays an important role in the study of unsaturated soil mechanics. According to the soil-water characteristic curve, the strength of unsaturated soil can be determined, the volume strain and permeability coefficient of unsaturated soil can be calculated, and it can also be used to estimate the distribution of ...

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Problems solved by technology

[0004] The purpose of the present invention is: in order to solve the problem that the current volume pressure plate instrument for measuring the soil-water characteristic curve of the soil sample cannot measure the volume change of the soil sample with the increase of the suction force during the test, so that the water content of the soil sample volume cannot be accurately calculated. Insufficient efficiency, the present invention provides a volume pressure plate instrument device that can directly measure the volume change of the soil sample, which can easily measure the volume change of the soil sample during the test process, and can accurately calculate the volume change and Strain, and volumetric moisture content, making the test results more accurate

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